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Thank you for this link. That was incredibly interesting. I won't spoil the twist at the end, suffice to say that I now am hoping for something like that in a scifi movie.

Discussed on HN: https://news.ycombinator.com/item?id=24362808

Supposing there was a large enough pool to do this effect with a person in it…would it give the perception of weightlessness?

I would be curious to try this using the upside down buoyancy demonstrated at the end of the video. That'd be... Trippy? Terrifying? Amazing?